AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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iain
May 30, 2012 10:58PM
Thanks Gang,

I was thinking of (1) as well at the time of the post but neglected to mention it. The others are kind of extensions of that.

To clarify, I was wondering if there was ever a reason to have something like this [1 -3 -1 1 3], an arbitrary contrast that sets some values positive, others negative, and they do not sum to zero. This is more the kind of thing that puzzled me. Why would someone do that? Or would they? I think the implication of your answer is that non-zero sum GLTs are basically used for tests where all terms are positive and unitary. That right?

cheers
Iain
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Subject Author Posted

GLT vs contrast

iain May 30, 2012 03:50PM

Re: GLT vs contrast

gang May 30, 2012 05:27PM

Re: GLT vs contrast

iain May 30, 2012 10:58PM

Re: GLT vs contrast

gang May 31, 2012 10:43AM

Re: GLT vs contrast

Isaac June 08, 2012 04:31PM